William m



(No Model.)

W. M. SUHR, BOILER COVERING COMPOSITION.

No. 339,820. Patented Apr. 13, 1886.

WITNESSES BY m -6 &% 9%

UNITED STATES PATENT OFFICE.

\VILLIAM M. SUHR, OF NEW YORK, N. Y.

BOILER-COVERING COMPOSITION.

SPECIFICATION forming part of Letters Patent No, 339,820, dated April 13, 1886.

Application tiletl February 19, IP86. Serial No. 192,532. (No specimens.)

To all whom it may concern:

Be it known that I, WILLIAM M. SUHR, of the city, county, and State of New York, have invented anew and Improved Boiler-Covering Composition, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure l is a cross-section of a boiler or tube covering made of my composition, and Fig. 2 is a longitudinal section ot the same.

My composition consists of the iollowingingredients, combined in the proportions stated, viz: solution of alum and soda, one part; mixture of hair or felt, one thirty-second part; asbestus fiber, one thirty-second part; mineral wool, one thirty-second part; cork and sawdust, twothirds part; plasterof-paris or other substance in sufficient quantity to form a mortar. These ingredients are to be thoroughly mingled by agitation to form a mortar.

The above-named composition is either cast in suitable molds in sections or otherwise, or is put on the boiler or tube to be covered by the use of a trowel and held in place by sheets of canvas, paper, or felt, or by means of stapies, straps, wires, or any other suitable fastening.

This composition forms a reliable fire-proof and at the same time a non-conducting boiler and tube covering.

The covering A, as shown in the drawings, is made in two parts, B and G, of the abovedescribed composition, which parts B and O are fastened together by staples D, and surrounded by a sheet of canvas, paper, felt, or other suitable material, E.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- The herein-described composition of matter to be used as a boiler or pipe covering, con sisting of a solution of alum and soda, a mixture of hair or felt, asbestus fibers, mineral wool, cork and sawdust, and plaster-ofparis or other similar substance, in the proportions specified.

\VILLIAM M. SUHR.

Witnesses:

THEO. G. HosTER, EDGAR TATE. 

